江西修水地区中元古界双桥山群修水组内波内潮汐沉积

INTER-WAVE AND INTER-TIDE DEPOSITS OF XIUSHUI FORMATION OF SHUANGQIAOSHAN GROUP IN MIDDLE PROTEROZOICERA IN XIUSHUI AREA,JIANGXI PROVINCE

详细论述了江西修水地区中元古界双桥山群修水组中的深水牵引流内波内潮汐的沉积特征及形成环境。深水牵引流内波内潮汐沉积具双向递变、单向递变和对偶层递变层序 ;其岩相可划分为双向交错层理砂岩相 ,单向交错层理砂岩相 ,砂岩、板岩薄互层相 ,波状、脉状、透镜状细砂岩、粉砂岩、板岩相 ;发育双向和单向交错层理、曲线型和干涉波痕及波状、脉状、透镜状层理 ;在综合分析的基础上 ,进一步建立了该区水道型和非水道型内波内潮汐沉积模式。

The paper has discussed in detail the sedimentary characteristics and sedimentary environment of inter wave and inter tide of deep water tractional current,from Xiushui Formation of Shuangqiaoshan Group,Middle Proterozoicera,in Xiushui area,Jiangxi Province.The deposition of inter wave and inter tide of deep water tractional current possesses bidirectional graded sequence and unidirectional graded sequence and antithetic graded sequence,and its lithofacies can then be divided into bidirectional cross bedding sandstone facies,and unidirectional cross bedding sandstone facies,and thin bedded alternation facies of sandstone,slate,and flaser,wavy and lenticular fine sandstone,siltstone,and slate facies.The sedimentary structure mainly includes unidirectional and bidirectional cross bedding,interference and curved ripple mark,and wavy,flaser and lenticular bedding.Finally,the inter wave and inter tide sedimentary model of channels and non channels has been established on the basis of comprehensive analysis.